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#include <boost/test/unit_test.hpp>
namespace wsclean::test {
/**
* Helper class for using using unique pointers in tests.
*
* Use case: When using unique pointers, tests often also store raw pointers
* for accessing objects after std::moving their unique pointer.
*
* This class supports this common pattern: Instead of storing both a unique
* pointer and a raw pointer, tests can use a single test::UniquePtr variable.
*
* The perfect forwarding constructor also simplifies initialization:
* "std::unique_ptr<X> x(new X(...));" becomes: "test::UniquePtr<X> x(...);"
*
* @tparam T Object type for the unique pointer.
*/
template <class T>
class UniquePtr {
public:
/**
* Constructor. It uses perfect forwarding for calling T's constructor.
*/
template <typename... Args>
UniquePtr(Args&&... args)
: _unique(new T(std::forward<Args>(args)...)), _raw(_unique.get()) {}
/**
* Extract the unique_ptr from the helper class.
* The test code may only call this function once.
*/
std::unique_ptr<T> take() {
BOOST_TEST_REQUIRE(static_cast<bool>(_unique));
return std::move(_unique);
}
T& operator*() { return *_raw; }
T* operator->() { return _raw; }
T* get() { return _raw; }
private:
std::unique_ptr<T> _unique;
T* const _raw;
};
} // namespace wsclean::test
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